Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.

it could be a dim adjustment. did you hook up the dimmer wire to the factory harness if so and your dash lights are low then thats the issue. if not then check the brightness on the unit. if that is not lowered then the internal lights inside the unit have started to burnout. if thats the case uninstall it and send it in for repairs

In order to calibrate the AVH-P5700DVD you need to press and hold the
Boost and the + button and then press the reset button with a pen.
continue to hold the Boost and + until the screen opens back up and you
can see the calibration screen. use the arrow nob on the right to
select the menu item, and the A button to select your item.

In order to calibrate the AHV-P5700DVD you need to press and hold the Boost and the + button and then press the reset button with a pen. continue to hold the Boost and + until the screen opens back up and you can see the calibration screen. use the arrow nob on the right to select the menu item, and the A button to select your item.

if the screen needs to be wired to the dash light switch it will not change unless the lights are on, if the wire is disconnected it is possible to bypass it making the screen stay bright.
although it would seem more likely that the brightness could be adjusted on the unit settings or by a button on the unit itself